Re: [PATCH v3 2/8] clk: samsung: add new clocks for DMC for Exynos5422 SoC

From: Chanwoo Choi
Date: Fri Feb 01 2019 - 04:20:15 EST

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Hi,

There are some wrong comments by me. Sorry for confusion.

On 19. 2. 1. ìí 5:07, Chanwoo Choi wrote:
> Hi,
>
> When I reviewed this patch, the almost changes are wrong.
> Frankly, I can't believe that you had tested and verified it
> on real board. Please check my comments.
> If I misunderstood, please let me know.
>
> On 19. 1. 31. ìí 5:49, Lukasz Luba wrote:
>> This patch provides support for clocks needed for Dynamic Memory Controller
>> in Exynos5422 SoC. It adds CDREX base register addresses, new DIV, MUX and
>> GATE entries.
>>
>> CC: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
>> CC: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
>> CC: Michael Turquette <mturquette@xxxxxxxxxxxx>
>> CC: Stephen Boyd <sboyd@xxxxxxxxxx>
>> CC: Kukjin Kim <kgene@xxxxxxxxxx>
>> CC: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
>> CC: linux-samsung-soc@xxxxxxxxxxxxxxx
>> CC: linux-clk@xxxxxxxxxxxxxxx
>> CC: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
>> CC: linux-kernel@xxxxxxxxxxxxxxx
>> Signed-off-by: Lukasz Luba <l.luba@xxxxxxxxxxxxxxxxxxx>
>> ---
>> drivers/clk/samsung/clk-exynos5420.c | 48 +++++++++++++++++++++++++++++++++---
>> 1 file changed, 44 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
>> index 34cce3c..3e87421 100644
>> --- a/drivers/clk/samsung/clk-exynos5420.c
>> +++ b/drivers/clk/samsung/clk-exynos5420.c
>> @@ -132,6 +132,8 @@
>> #define BPLL_LOCK 0x20010
>> #define BPLL_CON0 0x20110
>> #define SRC_CDREX 0x20200
>> +#define GATE_BUS_CDREX0 0x20700
>> +#define GATE_BUS_CDREX1 0x20704
>> #define DIV_CDREX0 0x20500
>> #define DIV_CDREX1 0x20504
>> #define KPLL_LOCK 0x28000
>> @@ -248,6 +250,8 @@ static const unsigned long exynos5x_clk_regs[] __initconst = {
>> DIV_CDREX1,
>> SRC_KFC,
>> DIV_KFC0,
>> + GATE_BUS_CDREX0,
>> + GATE_BUS_CDREX1,
>> };
>>
>> static const unsigned long exynos5800_clk_regs[] __initconst = {
>> @@ -425,6 +429,10 @@ PNAME(mout_group13_5800_p) = { "dout_osc_div", "mout_sw_aclkfl1_550_cam" };
>> PNAME(mout_group14_5800_p) = { "dout_aclk550_cam", "dout_sclk_sw" };
>> PNAME(mout_group15_5800_p) = { "dout_osc_div", "mout_sw_aclk550_cam" };
>> PNAME(mout_group16_5800_p) = { "dout_osc_div", "mout_mau_epll_clk" };
>> +PNAME(mout_mx_mspll_ccore_phy_p) = { "sclk_bpll", "mout_dpll_ctrl",
>> + "mout_mpll_ctrl", "ff_dout_spll2",
>> + "mout_sclk_spll"};
>
> - mout_dpll_ctrl was not defined. This patch doesn't define it.
> - mout_mpll_ctrl was not defined. ditto.
> - ff_dout_spll2 was only registered when SOC is EXYNOS5800.
> It meant that ff_dout_spll2 was not registered on exynos5422 board.
>
> It is wrong patch. You would have not checked the parent clocks
> except for sclk_bpll.
>
> Also,
> In the exynos5422 datasheet, MUX_MX_MSPLL_CCORE_PHY_SEL is possible
> having the six parents as following:
> - sclk_bpll
> - sclk_dpll
> - sclk_mpll
> - sclk_spll2
> - sclk_spll
> - sclk_epll
>
> Why do you missing last 'sclk_epll'?
>
>
>> +
>>
>> /* fixed rate clocks generated outside the soc */
>> static struct samsung_fixed_rate_clock
>> @@ -450,7 +458,7 @@ static const struct samsung_fixed_factor_clock
>> static const struct samsung_fixed_factor_clock
>> exynos5800_fixed_factor_clks[] __initconst = {
>> FFACTOR(0, "ff_dout_epll2", "mout_sclk_epll", 1, 2, 0),
>> - FFACTOR(0, "ff_dout_spll2", "mout_sclk_spll", 1, 2, 0),
>> + FFACTOR(CLK_FF_DOUT_SPLL2, "ff_dout_spll2", "mout_sclk_spll", 1, 2, 0),
>
> It doesn't affect the Exynos5422 because exynos5800_fixed_factor_clks[]
> is registered when SOC is EXYNOS5800. Exynos5422 board cannot use this clock.

It is my fault. Please ignore this comment.

>
>> };
>>
>> static const struct samsung_mux_clock exynos5800_mux_clks[] __initconst = {
>> @@ -472,11 +480,14 @@ static const struct samsung_mux_clock exynos5800_mux_clks[] __initconst = {
>> MUX(0, "mout_aclk300_disp1", mout_group5_5800_p, SRC_TOP2, 24, 2),
>> MUX(0, "mout_aclk300_gscl", mout_group5_5800_p, SRC_TOP2, 28, 2),
>>
>> + MUX(CLK_MOUT_MX_MSPLL_CCORE_PHY, "mout_mx_mspll_ccore_phy",
>> + mout_mx_mspll_ccore_phy_p, SRC_TOP7, 0, 3),
>> +
>
> Why do you modify the exynos5800_mux_clks instead of exynos5420_mux_clks
> or exynos5x_mux_clks? In the coverletter this patch is for Exynos5422 board.
> Did you test it?

It is my fault. Please ignore this comment.

>
>> MUX(CLK_MOUT_MX_MSPLL_CCORE, "mout_mx_mspll_ccore",
>> - mout_mx_mspll_ccore_p, SRC_TOP7, 16, 2),
>> + mout_mx_mspll_ccore_p, SRC_TOP7, 16, 3),
>
> ditto.

It is my fault. Please ignore this comment.

>
>> MUX_F(CLK_MOUT_MAU_EPLL, "mout_mau_epll_clk", mout_mau_epll_clk_5800_p,
>> SRC_TOP7, 20, 2, CLK_SET_RATE_PARENT, 0),
>> - MUX(0, "sclk_bpll", mout_bpll_p, SRC_TOP7, 24, 1),
>> + MUX(CLK_SCLK_BPLL, "sclk_bpll", mout_bpll_p, SRC_TOP7, 24, 1),
>
> ditto.

It is my fault. Please ignore this comment.

>
>> MUX(0, "mout_epll2", mout_epll2_5800_p, SRC_TOP7, 28, 1),
>>
>> MUX(0, "mout_aclk550_cam", mout_group3_5800_p, SRC_TOP8, 16, 3),
>> @@ -648,7 +659,7 @@ static const struct samsung_mux_clock exynos5x_mux_clks[] __initconst = {
>>
>> MUX(0, "mout_sclk_mpll", mout_mpll_p, SRC_TOP6, 0, 1),
>> MUX(CLK_MOUT_VPLL, "mout_sclk_vpll", mout_vpll_p, SRC_TOP6, 4, 1),
>> - MUX(0, "mout_sclk_spll", mout_spll_p, SRC_TOP6, 8, 1),
>> + MUX(CLK_MOUT_SCLK_SPLL, "mout_sclk_spll", mout_spll_p, SRC_TOP6, 8, 1),
>> MUX(0, "mout_sclk_ipll", mout_ipll_p, SRC_TOP6, 12, 1),
>> MUX(0, "mout_sclk_rpll", mout_rpll_p, SRC_TOP6, 16, 1),
>> MUX_F(CLK_MOUT_EPLL, "mout_sclk_epll", mout_epll_p, SRC_TOP6, 20, 1,
>> @@ -814,9 +825,13 @@ static const struct samsung_div_clock exynos5x_div_clks[] __initconst = {
>> DIV_CDREX0, 16, 3),
>> DIV(CLK_DOUT_CCLK_DREX0, "dout_cclk_drex0", "dout_clk2x_phy0",
>> DIV_CDREX0, 8, 3),
>> + DIV(0, "dout_cclk_drex1", "dout_clk2x_phy0", DIV_CDREX0, 8, 3),
>
> Hmm. CLK_DIV_CDREX0[10:8] of DIV_CDREX0 register was already implemented
> by CLK_DOUT_CCLK_DREX0. It is fault.
>
> Also, PCLK_CORE_MEM_RATIO[10:8] of DIV_CDREX1 register was defined as following
> in clock-exynos5420.c.
> - DIV(CLK_DOUT_PCLK_CORE_MEM, "dout_pclk_core_mem", "mout_mclk_cdrex", DIV_CDREX1, 8, 3),
>
>
>> DIV(CLK_DOUT_CLK2X_PHY0, "dout_clk2x_phy0", "dout_sclk_cdrex",
>> DIV_CDREX0, 3, 5),
>>
>> + DIV(0, "dout_pclk_drex0", "dout_cclk_drex0", DIV_CDREX0, 28, 3),
>> + DIV(0, "dout_pclk_drex1", "dout_cclk_drex1", DIV_CDREX0, 28, 3),
>
> dout_cclk_drex1 is wrong. It is fault.
>
>> +
>> DIV(CLK_DOUT_PCLK_CORE_MEM, "dout_pclk_core_mem", "mout_mclk_cdrex",
>> DIV_CDREX1, 8, 3),
>>
>> @@ -1170,6 +1185,31 @@ static const struct samsung_gate_clock exynos5x_gate_clks[] __initconst = {
>> GATE_TOP_SCLK_ISP, 12, CLK_SET_RATE_PARENT, 0),
>>
>> GATE(CLK_G3D, "g3d", "mout_user_aclk_g3d", GATE_IP_G3D, 9, 0, 0),
>> +
>> + GATE(CLK_CLKM_PHY0, "clkm_phy0", "dout_sclk_cdrex",
>> + GATE_BUS_CDREX0, 0, 0, 0),
>> + GATE(CLK_CLKM_PHY1, "clkm_phy1", "dout_sclk_cdrex",
>> + GATE_BUS_CDREX0, 1, 0, 0),
>> + GATE(0, "mx_mspll_ccore_phy", "mout_mx_mspll_ccore_phy",
>> + SRC_MASK_TOP7, 0, CLK_IGNORE_UNUSED, 0),
>> +
>> + GATE(CLK_ACLK_PPMU_DREX0_0, "aclk_ppmu_drex0_0", "dout_aclk_cdrex1",
>> + GATE_BUS_CDREX1, 15, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_PPMU_DREX0_1, "aclk_ppmu_drex0_1", "dout_aclk_cdrex1",
>> + GATE_BUS_CDREX1, 14, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_PPMU_DREX1_0, "aclk_ppmu_drex1_0", "dout_aclk_cdrex1",
>> + GATE_BUS_CDREX1, 13, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_ACLK_PPMU_DREX1_1, "aclk_ppmu_drex1_1", "dout_aclk_cdrex1",
>> + GATE_BUS_CDREX1, 12, CLK_IGNORE_UNUSED, 0),
>> +
>> + GATE(CLK_PCLK_PPMU_DREX0_0, "pclk_ppmu_drex0_0", "dout_pclk_cdrex",
>> + GATE_BUS_CDREX1, 29, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_PCLK_PPMU_DREX0_1, "pclk_ppmu_drex0_1", "dout_pclk_cdrex",
>> + GATE_BUS_CDREX1, 28, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_PCLK_PPMU_DREX1_0, "pclk_ppmu_drex1_0", "dout_pclk_cdrex",
>> + GATE_BUS_CDREX1, 27, CLK_IGNORE_UNUSED, 0),
>> + GATE(CLK_PCLK_PPMU_DREX1_1, "pclk_ppmu_drex1_1", "dout_pclk_cdrex",
>> + GATE_BUS_CDREX1, 26, CLK_IGNORE_UNUSED, 0),
>> };
>>
>> static const struct samsung_div_clock exynos5x_disp_div_clks[] __initconst = {
>>
>
>

--
Best Regards,
Chanwoo Choi
Samsung Electronics

Next message: Sam Ravnborg: "Re: [PATCH v1 0/19] drm/panel: drmP.h removal and DRM_DEV*"
Previous message: Marc Zyngier: "Re: [PATCH 00/10] GICv3 support for kexec/kdump on EFI systems"
In reply to: Chanwoo Choi: "Re: [PATCH v3 2/8] clk: samsung: add new clocks for DMC for Exynos5422 SoC"
Next in thread: Lukasz Luba: "Re: [PATCH v3 2/8] clk: samsung: add new clocks for DMC for Exynos5422 SoC"
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